package cn.my.framework.config.security;

import cn.my.framework.util.ConstantData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;

/**
 * Created by zhangl_lc on 2017/7/5.
 */
@Component("mySecurityFilterInterceptor")
public class MySecurityFilterInterceptor extends AbstractSecurityInterceptor implements Filter {

    @Autowired
    private MyInvocationSecurityMetadataSource mySecurityMetadataSource;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Autowired
    public void setMyAccessDecisionManager(MyAccessDecisionManager myAccessDecisionManager) {
        super.setAccessDecisionManager(myAccessDecisionManager);
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        if(ConstantData.securityEnable){
            FilterInvocation fi = new FilterInvocation(request,response,chain);
            invoke(fi);
        }else{
            chain.doFilter(request,response);
        }
    }

    public void invoke(FilterInvocation fi) throws IOException, ServletException {
        //fi里面有一个被拦截的url
        //里面调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限
        //再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
        InterceptorStatusToken token = super.beforeInvocation(fi);
        try {
            fi.getChain().doFilter(fi.getRequest(),fi.getResponse());
        } finally {
            super.afterInvocation(token, null);
        }
    }

    @Override
    public void destroy() {}

    @Override
    public Class<?> getSecureObjectClass() {
        return FilterInvocation.class;
    }

    @Override
    public SecurityMetadataSource obtainSecurityMetadataSource() {
        return this.mySecurityMetadataSource;
    }

}
